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uiten tetes stent @ffice HENRY DAVIS, OF ABINGDON, ILLINOIS.

Letters Patent No. 61,521, dated January 29, V1867.

IMPROVED SELI'ADJUSTING TBESTLE.

TO ALL TO WHOM IT MAY CONCERN:

Be it known that I, HENRY DAVIS, of the city of Abingdon, in the county of Knox, in the State of Illinoishave invented a new and useful machinefor the use of builders, Plasterers, and painters, being aSelf- Adjusting Trestle, to be used instead of erecting'scaffolding or benches, said machine being known as Daviss SclffAdjusting Trestle; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being' had to the annexed drawings, making a part of this specification, in Which- Figure I is thc trestle as extended.

Figure 2 is the trestle nearly closed.

Figure 3 is the brace.

Figure 4 is the legs and standard.

Figure 5, the extension bands.

The trestle is made in two parts, which correspond with each other. Take either of these parts, let the' legs andstandard be at the left hand, draw back the legs tothe left hand pcrpendicularly to the standard, tighten the screw a, raise the end of the brace b, and adjust it to the eX tension-board 'at' the screiv c, tighten screw d. Look at the hook c at the end of the extension-board, and-set it so that the' top part of it points towards you.v Then take the other part of the trestle, andput that together in the same manner, setting the hook at the end of the extensiomboard so that the top part of it points from you. Then lay one hook on the top of one extension-board and the other hook on the top ofthe other extension-board; push the two parts of the trestle together till the hooks touch the standards. The trestle'then will be in working order, or ready to receive the boards for the scaffolding. Two of. these trestles will of course be required for Work, sometimes three, depending upon thelength theV scaffolding or bench is required. The scaffolding, as the trestle thus stands, will be about three feet high. To extend the trestle, it vis only necessary to draw it apart by the standards. It can be' extended to about thirteen feet or more, depending of course uponthe length of the extension-boards. When extended to its full length, take the loose bolt which is in the leg of the trestle, and pass it through the holes near the ends of the .extension-boards, and tighten it, which keeps the extension-boards in their proper placesl in case of removing or drawing the trestle ivhen extended. The trestle can be raised to about six feet, or double the height of thestandards. To raise t,vl,oosen the bolts a and cl, and raise the extension-boards to the height desired, inserting the pins attached to the.legs in one of the holes of the standards. In case it is desired thatthe scaiolding should be lovver than about three feet, 'which is often required in Plastering and painting, it can be made lower by the following Inode: Separate thetwo parts of the trestle by lifting the ends of the extension-boards, thus unhooking the-m; loosen the, bolts a and d, and detach the brace from bolt c; then turn the brace and legs back over the short end of the extension-board, bringing the end of the brace back to bolt e and attach it.; bring the standard pcrpendieularl'y to the legs, lplace the p'in in the standard at the desired height, and tighten thebolts aand d. Then reverse the hook by turning it upside down. Put the other part of the trestle in the same position by a similar process, and lay the hooks over the extension-boards, as before mentioned. For some purposes, such as painting, building, carpenter-Work, &c., it is not generally necessary to have an extension-trestle, land in that case one of the extension-boards is omitted, and the other is attached permanently to thestandards. v

What I claim as my invention, and desire to secure by Letters Patent, is

The construction and arrangement of a trestle in the manner and for the purpose herein described.

. HENRY DAVIS.

Witnesses F. CHRISTIANER, W. DAVIS. 

